From: Juergen Gross <jgross@suse.com>
Date: Fri, 7 Sep 2018 13:30:09 +0200
Subject: [PATCH 4/5] xen/blkfront: reorder tests in xlblk_init()
Git-commit: 4bcddbae019df2614ea36976ba3d36313f93c6d3
Patch-mainline: v4.19-rc2
References: bsc#1085042
In case we don't want pv block devices we should not test parameters
for sanity and eventually print out error messages. So test precluding
conditions before checking parameters.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/block/xen-blkfront.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 25f28c3fe7a5..2172619c51f0 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2707,6 +2707,15 @@ static int __init xlblk_init(void)
if (!xen_domain())
return -ENODEV;
+ if (!xen_has_pv_disk_devices())
+ return -ENODEV;
+
+ if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
+ pr_warn("xen_blk: can't get major %d with name %s\n",
+ XENVBD_MAJOR, DEV_NAME);
+ return -ENODEV;
+ }
+
if (xen_blkif_max_segments < BLKIF_MAX_SEGMENTS_PER_REQUEST)
xen_blkif_max_segments = BLKIF_MAX_SEGMENTS_PER_REQUEST;
@@ -2722,15 +2731,6 @@ static int __init xlblk_init(void)
xen_blkif_max_queues = nr_cpus;
}
- if (!xen_has_pv_disk_devices())
- return -ENODEV;
-
- if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
- printk(KERN_WARNING "xen_blk: can't get major %d with name %s\n",
- XENVBD_MAJOR, DEV_NAME);
- return -ENODEV;
- }
-
INIT_DELAYED_WORK(&blkfront_work, blkfront_delay_work);
ret = xenbus_register_frontend(&blkfront_driver);
--
2.17.0